2.Custom Metal Buttons Partial modelling. Due to factors such as producibility, craftsmanship and safety, metal buttons are most commonly round, hexagonal, unequal, equilateral, etc. Metal Buttons The most common three-dimensional shapes are round spheres, hemispheres, floating shapes and other three-dimensional shapes.Metal Buttons Partial modelling is most common on the basis of the shape of the shape of the individual and all the local details of the modelling, such as the addition of Arabic numerals, English letters, flat composition patterns, animals, portraits, flowers, registered trademarks and floral patterns.